If the forum-markup square-brackets literal "spoiler" tags are used, that won't help; those only hide anything if you have JavaScript allowed from the right site(s), and I have that blocked via NoScript except by special dispensation. That's one reason why I use the white-text method of spoiler concealment; it works for anyone who has the site-specified background colors, which is a broader category than people who have scripts active.
Good suggestion, though.
Good suggestion, though.